Puls UB10.245 Technical Data

U–Series

DC-UPS, DUAL OUTPUT

UB10.245

5. INPUT

Input voltage nom. DC 24V
Input voltage ranges
30 to 35Vdc Temporarily allowed, no damage to the DC-UPS *)

Allowed input voltage ripple
1Vpp Bandwidth 400Hz to 1kHz

Allowed voltage between input
and earth (ground)

Turn-on voltage typ.

Input current **) typ. 140mA Internal current consumption
typ. 1.1A Current consumption for battery charging in constant

External capacitors on the input No limitation

*) The DC-UPS shows “Check Wiring” with the red LED and buffering is not possible
**) The total input current is the sum of the output current, the current which is required to charge the battery during the

charging process and the current which is needed to supply the DC-UPS itself. See also Fig. 5-2. This calculation does not apply
in overload situations where the DC-UPS limits the output current, therefore see Fig. 5-3.

***) Please note: This is the input current and not the current which flows into the battery during charging. The battery current can

be found in chapter 8.

Fig. 5-1 Input voltage range Fig. 5-2 Input current, definitions

V

OUT

D

AB

nom. 22.5 to 30Vdc Continuous operation, see Fig. 5-1

35Vdc Absolute maximum input voltage with no damage to the

DC-UPS

0 to 22.5Vdc The DC-UPS switches into buffer mode and delivers

output voltage from the battery if the input was above
the turn-on level before and all other buffer conditions
are fulfilled.

max. 1.5Vpp Bandwidth <400Hz

max. 60Vdc or

42.4Vac

max.

22.8Vdc
23Vdc

The output does not switch on if the input voltage does
not exceed this level.

current mode at 24V input See Fig. 8-2 ***)

C

Input

Current

Output
Current

18 30 35V22.50

A: Rated input voltage range
B: Temp. allowed, no harm to the unit
C: Absolute max. input voltage
D: Buffer mode

V

IN

Internal
current

consumpt ion

Current

consumpt ion

for battery

charging

Electronic output current limitation

The DC-UPS is equipped with an electronic output
current limitation. This current limitation works in a
switching mode which reduces the power losses and
heat generation to a minimum. As a result, the

Fig. 5-3 Input current vs. 24V output current,

20V

10

typ. (battery fully charged)

Output Voltage

Overload

output voltage drops since there is not enough
current to support the load. A positive effect of the
current limitation in switching mode is that the input
current goes down despite an increase in the output
current resulting in less stress for the supplying
source. Fig. 5-3 shows the behavior when the 12V is
not loaded. Power which is taken out from the 12V
reduces the power on the 24V side.

20A

15

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10

5

0

0

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4812 20A

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May. 2008 / Rev. 1.0 Datasheet DS-UB10.245-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.

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U–Series

DC-UPS, DUAL OUTPUT

UB10.245

6. OUTPUT IN NORMAL MODE

The total output power of 360W can be shifted dynamically between the two outputs.

24V Output:
Output voltage

Voltage drop between input and
output

Ripple and noise voltage
Output current nom. 0 – 15A Continuously allowed, lower if the 12V output is loaded.
min. 12.3A Output if 12V output is loaded with 5A.
Short-circuit current
max. 21A
Capacitive and inductive loads No limitation

12V Output:

Output voltage
Output voltage tolerance ±2%
Ripple and noise voltage

Output current

Short-circuit current min. 4A
max. 5.5A
Capacitive and inductive loads No limitation

*) This figure shows the ripple and noise voltage which is generated by the DC-UPS. The ripple and noise voltage might be higher if

the supplying source has a higher ripple and noise voltage.

Fig. 6-1 Input to output voltage drop, typ.

Input to Output
Voltage drop

0.4V

0.35

0.3

0.25

0.2

0.15

0.1

0.05
0

02 10

4 6 8 12 14 16

u

p

t

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O

nom. DC 24V The output voltage follows the input voltage reduced by the

input to output voltage drop.

max.
max.

0.3V

0.45V

At 10A output current, see Fig. 6-1 for typical values
At 15A output current, see Fig. 6-1 for typical values

max. 20mVpp 20Hz to 20MHz, 50Ohm *)

min. 17.9A

Load impedance 100mOhm, see Fig. 6-2 for typical values. The
12V output is off during an overload or short on the 24V.

nom. DC 12V

typ. 30mVpp 20Hz to 20MHz, 50Ohm *)
nom. 0 - 5A Continuously allowed, may be lower if the 24V output is loaded

more than 12.3A

Load impedance 100mOhm, see Fig. 7-5. for typical values. The
24V output is on during an overload or short on the 12V.

Fig. 6-2 Output voltage vs. output current in

normal mode at 24V input, typ.

Output Voltage

28V

24

20

t

n

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C

t

18A

16

12

8

4
0

0 5 10 15 20

Output Current

25A

May. 2008 / Rev. 1.0 Datasheet DS-UB10.245-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.

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4/24

U–Series

DC-UPS, DUAL OUTPUT

UB10.245

7. OUTPUT IN BUFFER MODE

If the input voltage falls below the transfer threshold level, the DC-UPS starts buffering without any interruption or
voltage dips. The transfer threshold level is typically 80mV higher than the 24V output voltage in buffer mode.
Buffering is possible even if the battery is not fully charged.

24V Output
Output voltage

22.45V ±1%, at no load,

Ripple and noise voltage
Output current nom. 0 - 10A Continuously allowed, 12V output not loaded.
10 - 15A *) 12V output not loaded.

Short-circuit current
max. 21A

12V Output

Output voltage
Output voltage tolerance ±2%
Ripple and noise voltage

Output current

Short-circuit current min. 4A

*) If the output current is in the range between 10A and 15A (Bonus Power) for longer than 5s, a hardware controlled

reduction of the maximal output current to 10A occurs. If the 10A are not sufficient to maintain the 24V, buffering stops at
both outputs after another 5s. The buffering is possible again as soon as the input voltage recovers.

**) If the nominal output voltage cannot be maintained in buffer mode, the DC-UPS switches off after 5s to save battery

capacity.

Fig. 7-1 Buffering transition, definitions Fig. 7-2 Transfer behavior, typ.

nom. DC 24V Output is stabilized and independent from battery voltage

22.25V ±1%, at 10A output current
max. 20mVpp 20Hz to 20MHz, 50Ohm

min. 7.0A If 12V output is loaded with 5A.
min. 17.9A

Load impedance 100mOhm **); The 12V output is off during an
overload or short on the 24V.

nom. DC 12V Output is stabilized and independent from battery voltage

typ. 30mVpp 20Hz to 20MHz, 50Ohm ;
nom. 0 - 5A Continuously allowed, may be lower if the 24V output is loaded

more than 7.0A
Load impedance 100mOhm, see Fig. 7-5 for typical values.

max. 5.5A

Continuous constant; The 24V output is on during an overload
or short on the 12V as long as the battery delivers current.

O

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4

2

V

V

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Input
voltage

Output
voltage

28V
24V

Transfer

threshold

Buffer mode

4

2

V

2

2

.

5

2

V

a

t

1

0

A

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0

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5

May. 2008 / Rev. 1.0 Datasheet DS-UB10.245-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.

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5/24